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Structure and Properties of La-Doping (Na0.5Bi0.5)TiO3 Piezoelectric Ceramics
Author(s): Chen Jianhua, Qu Shaobo, Zhu Linhu, Pei Zhibin, Che Jun
Pages: 539-
542
Year: 2007
Issue:
z3
Journal: RARE METAL MATERIALS AND ENGINEERING
Keyword: 无铅压电陶瓷; 钛酸铋钠; 镧掺杂;
Abstract: 采用传统陶瓷工艺制备了镧掺杂(Na0.5Bi0.5)TiO3无铅压电陶瓷,研究了材料的结构、介电和压电性能.发现镧掺杂有利于生成稳定的钙钛矿结构,促进了晶粒生长.镧掺杂(Na0.5Bi0.5)TiO3陶瓷表现出明显的弛豫特性,当镧掺杂量为5mol%时,1200℃烧结样品室温下的介电常数从630提高到855,介电损耗从5.2%减小到3.3%.适量的镧掺杂大幅降低了材料的电导率,最佳的掺杂量为1 mol%,测量温度为75℃时,该配方1200℃烧结样品的电导率σ仅为7.75148×10-13S·cm-1,同掺杂前的9.50827×10-11 S·cm-1前相比减小了3个数量级.
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